<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片试图区 -->
    <el-card>
      <!-- btn按钮 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>

      <!-- 表格 -->
      <tree-table
        class="treetable"
        :data="cateList"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        :show-index="true"
        index-text="#"
        border
        :show-row-hover="false"
      >
        <!-- 是否有效 -->
        <template slot="isOk" slot-scope="scope">
          <i class="el-icon-success" v-if="scope.row.cat_deleted===false"></i>
          <i class="el-icon-error" v-else></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
          <el-tag size="mini" type="success" v-else-if="scope.row.cat_level===1">二级</el-tag>
          <el-tag size="mini" type="warning" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button
            type="primary"
            size="mini"
            icon="el-icon-edit"
            @click="editCateBtn(scope.row)"
          >编辑</el-button>
          <el-button
            type="danger"
            size="mini"
            icon="el-icon-delete"
            @click="delCateBtn(scope.row)"
          >删除</el-button>
        </template>
      </tree-table>

      <!-- 分页 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 8, 10]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      ></el-pagination>
    </el-card>

    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisble"
      width="50%"
      @close="addCateDialogClosed"
    >
      <!-- 添加分类的表单 -->
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <!-- options  用来指定数据源
            props  用来指定配置对象
            cascaderProps  用来指定配置对象
            model  必修绑定一个数组   
          expand-trigger="hover"  (不用了)-->
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            expand-trigger="hover"
            :props="cascaderProps"
            @change="cascaderCateChanged"
            clearable
            change-on-select
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisble = false">取 消</el-button>
        <el-button type="primary" @click="addCateBtn">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 编辑对话框 -->
    <el-dialog title="修改分类" :visible.sync="editCateDialogVisible" width="50%">
      <el-form
        :model="editCateForm"
        :rules="editCateFormRules"
        ref="editCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称" prop="cat_nam">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类" prop="cat_nam">
          <el-cascader
            v-model="selectedKeys"
            :options="parentCateList"
            :props="cascaderProps"
            @change="cascaderCateChanged"
            change-on-select
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="insertCateBtn">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //商品分类的数据列表
      cateList: [],
      //查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      //总数据条数
      total: 0,
      //为table指定列的定义
      columns: [
        {
          label: "分类名称",
          prop: "cat_name",
        },
        {
          label: "是否有效",
          prop: "likes",
          minWidth: "200px",
          //表示将当前列定义为模板列
          type: "template",
          //表示当前这一列使用的模板名称
          template: "isOk",
        },
        {
          label: "排序",
          type: "template",
          template: "order",
        },
        {
          label: "操作",
          type: "template",
          template: "opt",
        },
      ],
      //控制添加分类对话框的显示与隐藏
      addCateDialogVisble: false,
      //添加分类的表单数据对象
      addCateForm: {
        //将要添加的分类名称
        cat_name: "",
        //父级分类的id
        cat_pid: 0,
        //默认等级是一级分类
        cat_level: 0,
      },
      //添加分类表单的验证规格对象
      addCateFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" },
          { min: 2, max: 8, message: "长度在 2 到 8 个字符", trigger: "blur" },
        ],
      },
      //父级分类的列表
      parentCateList: [],
      //指定级联选择器的配置对象
      cascaderProps: {
        value: "cat_id",
        label: "cat_name",
        children: "children",
      },
      //选中的父级分类id数组
      selectedKeys: [],
      //编辑对话框的显示与隐藏
      editCateDialogVisible: false,
      //根据id查询返回的数据
      editCateForm: {
        cat_name: "",
        cat_level: "",
        cat_pid: "",
      },
      //修改【表单的分类名称验证规则
      editCateFormRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" },
          { min: 2, max: 8, message: "长度在 2 到 8 个字符", trigger: "blur" },
        ],
      },
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.queryInfo,
      })
      if (res.meta.status !== 200) {
        return this.$message.error("获取失败")
      }
      //    console.log(res.data);
      this.cateList = res.data.result
      //为总数据条数赋值
      this.total = res.data.total
    },
    //监听pagesize改变
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    //监听pagenum的待变
    handleCurrentChange(newNum) {
      this.queryInfo.pagenum = newNum
      this.getCateList()
    },
    //点击添加分类按钮
    showAddCateDialog() {
      //先获取父级的数据列表
      this.getParentCateList()
      this.addCateDialogVisble = true
    },
    //获取前两级父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get("categories", {
        params: { type: 2 },
      })
      if (res.meta.status !== 200) {
        return this.$message.error("获取父级分类数据失败")
      }
      this.parentCateList = res.data
    },
    //选择项发生变化触发函数
    cascaderCateChanged() {
      console.log(this.selectedKeys)
      //如果selectedKeys数组中的长度大于0则选中了分类，反之没有选中
      if (this.selectedKeys.length > 0) {
        //父级分类的id
        this.addCateForm.cat_pid = this.selectedKeys[
          this.selectedKeys.length - 1
        ]
        //为当前分类的等级赋值
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      } else {
        //父级分类的id
        this.addCateForm.cat_pid = 0
        //为当前分类的等级赋值
        this.addCateForm.cat_level = 0
      }
    },
    //确认添加分类按钮
    addCateBtn() {
      this.$refs.addCateFormRef.validate(async (valid) => {
        if (!valid) {
          return this.$message.error("添加数据有误")
        }
        const { data: res } = await this.$http.post(
          "categories",
          this.addCateForm
        )
        if (res.meta.status !== 201) {
          return this.$message.error("添加分类失败")
        }
        this.$message.success("添加成功")
        this.addCateDialogVisble = false
        this.getCateList()
      })
    },
    //监听对话框的关闭事件重置
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    },
    //监听删除按钮
    async delCateBtn(role) {
      const resultConfirm = await this.$confirm(
        "此操作将永久删除该文件, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err)
      if (resultConfirm !== "confirm") {
        return this.$message.info("取消了删除")
      }
      const { data: res } = await this.$http.delete("categories/" + role.cat_id)
      if (res.meta.status !== 200) {
        return this.$message.error("删除失败")
      }
      this.$message.success("删除成功")
      this.getCateList()
    },
    //编辑按钮事件
    async editCateBtn(role) {
      //根据当前id去查信息
      const { data: res } = await this.$http.get("categories/" + role.cat_id)
      if (res.meta.status !== 200) {
        return this.$message.error("查询失败")
      }
      // console.log(res.data)
      this.editCateForm = res.data
      this.getParentCateList()
      this.selectedKeys = res.data.cat_pid
      this.editCateDialogVisible = true
    },
    //编辑分类的确定按钮
    insertCateBtn() {
      this.$refs.editCateFormRef.validate(async (valid) => {
        if (!valid) {
          return this.$message.error("输入信息有误")
        }
        const { data: res } = await this.$http.put(
          "categories/" + this.editCateForm.cat_id,
          { cat_name: this.editCateForm.cat_name }
        )
        if (res.meta.status !== 200) {
          return this.$message.error("编辑失败")
        }
        this.$message.success('编辑成功')
        this.editCateDialogVisible=false
        this.getCateList()
      })
    },
  },
}
</script>

<style lang="less">
.el-icon-success {
  color: lightgreen;
}
.el-icon-error {
  color: lightcoral;
}
.treetable {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>